When trying to add a Software Site (p2 plugin repository - either one generated by p2 Publisher or Nexus with p2 support) to a target definition via the "Target Definition Wizard" there seem to be "no items available" preventing the site to be added.
The same problem has been reported e.g. here: https://docs.sonatype.org/display/Nexus/Nexus+OSGi+Experimental+Features+-+P2+Repository+Plugin?focusedCommentId=12943363#comment-12943363
Tycho and the https://github.com/ifedorenko/p2-browser are capable of fetching the metadata and contents though, since the site contains a number of bundles (in "plugins" dir) along with artifacts.xml and content.xml.
Is there a known limitation/bug of the UI related to this behaviour or could you please point me to a workaround?